Early 90's Toyota 4x4 manual trans additive.

[dfarr67]

Replaced the auto with a mt5 used trans G58 I think, doesn't leak, shifts fine- but it's got a high mileage noise, not too bad and I can live with it. Current fill is a recycled GM Synchromesh fill that the Honda didn't like. Any additives that will tone it down a little?

 

[Marcozi]

I replace the syncomesh fluid with a high quality fully synthetic gear oil. Check redline for the lube.

 

[Toy4x4]

What @Marcozi said. I used Redline MT-90 in my 93 DLX 4x4. Shifted like butter afterwards.

 

[dfarr67]

I've got MTL of Amsoil 75-90 on the shelf.....both GL4

 

[JHZR2]

I've got MTL of Amsoil 75-90 on the shelf.....both GL4

Amsoil would be my choice too. It retains shift quality better than redline IME.